Re-seed Existing Cache Only

Re-seed Existing Cache Only

Is it possible to refresh MapCache's existing tile cache by reseeding only the tiles that currently exist in the cache, and nothing more? If the cached tiles are spread over every country and zoom level, it's not feasible to define shapefiles to encompass all of them.

The documentation isn't clear whether the "-o" flag will also seed tiles not already in the cache in addition to reseeding existing ones, but if the behavior is like that of MapProxy then it would seed everything.